A bug allowed anyone to view live chats and contact requests of their "friends," and ironically enough, the loophole was only accessible through a link to edit your own privacy settings.

The chat feature has since been restored, with Facebook issuing a statement that "We worked quickly to resolve this matter, ensuring that once the bug was reported to us, a solution was quickly found and implemented."

Poor software engineering and testing at the company has in the past led to messages from users ending up in the wrong inbox, and accidentally exposing the private email addresses of users.